/* 顶部导航栏 */

.mainnav {
    width: 100%;
    height: 70px;
    position: fixed;
    background-color: rgba(0, 0, 0, .1);
}

.mainnav .main .main_box .col-md-1 a {
    width: 100%;
    height: 100%;
    display: block;
}

.main_box .col-md-1 {
    padding: 15px 0 15px 25px;
}

.main_box .col-md-2 button {
    margin: 20px 0;
    padding: 6px;
    border: 1px solid #ffffff;
    color: #ffffff;
    background-color: rgba(0, 0, 0, .1);
}

.main_box .col-md-9 ul {
    display: flex;
    justify-content: space-around;
}

.main_box .col-md-9 ul li {
    padding: 30px 20px 16px 20px;
}

.main_box .col-md-9 ul li:hover {
    border-bottom: 4px solid #ffffff;
}

.main_box .col-md-9 ul li a {
    text-decoration: none;
    color: #fff;
}


/* 头部 */

.header {
    background: url(../images/softwareimg/top_banner6.png) no-repeat;
    background-size: 100% 100%;
    padding: 111px 0;
}

.hader {
    text-align: center;
    color: #ffffff;
}

.hader h2 {
    font-size: 42px;
}


/* 当前位置 */

li {
    list-style: none;
}

.content_box ul li a {
    color: #666666;
    text-decoration: none;
}

.content_box ul {
    padding: 0;
    margin-top: 15px;
    display: flex;
}

.content_box ul li .content_box_chanpin {
    color: #333333;
}


/* 关于我们标题 */

.aboutus {
    text-align: center;
}

.aboutus h2 {
    color: #707070;
    margin-top: 156px;
}

.aboutus h2::after {
    display: block;
    content: '';
    width: 120px;
    height: 4px;
    margin: 21px auto;
    background-color: #468eff;
}

.aboutus p {
    color: #a2a2a3;
}


/* 图片 */

@media(max-width:768px) {
    .img img {
        width: 100%;
    }
}

@media(min-width:768px) {
    .img img {
        width: 100%;
    }
}

.img {
    margin-top: 40px;
}


/* 〝超快排"——快速排名就找超快排 */

.aboutus_box ul {
    margin-top: 50px;
}


/* 发展历程年段 */

.course_left {
    display: flex;
    justify-content: space-between;
    padding-bottom: 405px;
}

.course_txt {
    display: flex;
    padding-right: 30px;
    justify-content: center;
}

.course_left_con {
    position: relative;
    top: 0;
    left: 0;
}

.course_left_con h4 {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 38px;
}

.course_left_con p {
    margin-top: 60px;
}

.course_right h4 {
    font-size: 38px;
}

.course_right {
    padding-bottom: 40px;
}

.course_right:nth-child(odd) {
    visibility: hidden;
}

@media(min-width:1200px) {
    .course_right {
        padding-bottom: 265px;
    }
}

@media(max-width:1200px) {
    .course_right:nth-child(odd) {
        visibility: visible;
    }
}


/* 底部 */

.footer {
    padding-bottom: 30px;
    background-color: #22263d;
}

.footer_txt ul {
    padding-left: 180px;
    display: flex;
}

.footer_txt ul li a {
    color: #bbbbbb;
    text-decoration: none;
}

.footer_txt ul li {
    color: #bbbbbb;
    padding: 40px 10px;
}

.footer_cnt {
    display: flex;
}

.footer_cnt div:nth-child(1) {
    padding-left: 180px;
    padding-top: 20px;
}

.footer_cnt div:nth-child(2) {
    padding-top: 30px;
}

.footer_cnt div:nth-child(2) ul li a {
    text-decoration: none;
    color: #bbbbbb;
}

.footer_cnt div:nth-child(3) {
    height: 80px;
    width: 1px;
    margin: 0 80px;
    background-color: #444444;
}

.footer_cnt div:nth-child(4) {
    text-align: center;
    color: #bbbbbb;
}

.footer_cnt ul {
    display: flex;
}

.footer_cnt ul li {
    padding: 0 20px;
}

.footer_bottom {
    display: flex;
    justify-content: center;
    color: #bbbbbb;
}


/* 底部显示和隐藏 */

@media(max-width:768px) {
    .footer {
        display: none;
    }
}

@media(min-width:768px) {
    .footer {
        display: none;
    }
}

@media(min-width:1200px) {
    .footer {
        display: block;
    }
}